通行证到父窗口

Question

我想问一下，

我有一个名为MainWindow窗口和另一个叫ImportForm。 在MainWindow我打电话

private void generate_Window(int num_chart) 
{ 
    Window ownedWindow = new ImportForm(num_chart); 
    ownedWindow.Owner = this;  
    ownedWindow.Show(); 
} 

在子窗口我做一些东西，我产生了一些变数。像var1，var2，var3。

我希望在子窗口关闭返回var1，var2，var3到MainWindow并调用一个函数让我们说import_chart(var1, var2, var3) ..

任何帮助将apretiated。 谢谢

Answer 1

这似乎是一个尴尬的设计选择。不管怎么说，这里是你如何能做到这一点：

MainWindow.cs：

private void generate_Window(int num_chart) 
{ 
    Window ownedWindow = new ImportForm(num_chart, import_chart); 
    ownedWindow.Owner = this; 
    ownedWindow.Show(); 
} 

private void import_chart(int n, string s, bool b) 
{ 
    //Do something 
} 

ImportForm.cs：

private Action<int, string, bool> callback; 
public ImportForm(int num_chart, Action<int, string, bool> action) 
{ 
    InitializeComponent(); 
    Closed += ImportForm_Closed; 
    callback = action; 
} 

private void ImportForm_Closed(object sender, EventArgs e) 
{ 
    callback(0, "Test", false); 
} 

只要改变行动你所需要的参数类型（以及调整ImportForm_Closed （...）也可以使用它们）。

如果有什么不清楚的地方，请告诉我。

Answer 2

如何将事件添加到您的ImportForm“ImportFinished”中，您将值作为eventargs传入。此事件在ImportForm的Close或Closing事件中触发，并在您的MainWindow中处理。 您也可以将ImportForm显示为模式对话框，并在ShowDialog方法返回时读取值。

Answer 3

一个简单的方法来做到这一点是让var1，var2和var3实例变量是在父的范围内可见（如让他们public），然后在MainWindow，重视Closed事件，从(ImportForm)sender读取变量。

Answer 4

我有我自己的代码的例子。这是通用和明显的，我可以在这里分享。

我已经做了一些沿着这些线。

/// <summary> 
    /// Show an InputBox similar to the pre-.NET InputBox functionality. Returns the original value when Cancel was pressed. 
    /// </summary> 
    /// <param name="OriginalValue">Pre-populated value in the input box</param> 
    /// <param name="PromptText">Prompt text displayed on the form</param> 
    /// <param name="Caption">Window caption</param> 
    /// <returns>InputBoxResult structure containing both the DialogResult and the input text. Warning: The input text will always be returned regardless of the DialogResult, so don't use it if the DialogResult is Cancel.</returns> 
    public static InputBoxResult Show(string OriginalValue = "", string PromptText = "", string Caption = "") { 
     InputBox form = new InputBox { 
      Text = Caption, 
      lblPrompt = {Text = PromptText}, 
      txtInput = {Text = OriginalValue} 
     }; 

     InputBoxResult res = new InputBoxResult(); 
     res.Result = form.ShowDialog(); 
     res.Input = form.txtInput.Text; 

     return res; 
    } 

我创建了一个名为InputBoxResult这样的类：

/// <summary> 
    /// Represents the results from an InputBox.Show call, including the DialogResult 
    /// and the input data. Note that the input data is always populated with the 
    /// user-entered data regardless of the DialogResult - this is inconsistent with 
    /// the old InputBox behavior and may change in the future. 
    /// </summary> 
    public struct InputBoxResult { 
     /// <summary> 
     /// Describes the way the dialog was resolved (OK/Cancel) 
     /// </summary> 
     public DialogResult Result { get; set; } 
     /// <summary> 
     /// User-entered text 
     /// </summary> 
     public string Input { get; set; } 

     /// <summary> 
     /// Translate this result into a string for easy debugging 
     /// </summary> 
     /// <returns></returns> 
     public override string ToString() { 
      return "Result: " + Result.ToString() + 
       "\r\nInput: " + Input.ToString(); 
     } 
    }